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M5.5 Earthquake near Near East Coast of Honshu, Japan

UTC time: 2025-08-21 22:34:41 UTC Local time: —
Earthquake newsQuakeMap24
Archive record · original publication time was not recorded

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

Magnitude
M5.5
Depth
10.0 km
Source
GFZ

Near East Coast of Honshu, Japan

Map

M5.5 Earthquake near Near East Coast of Honshu, Japan · 2025-08-21 — Map showing the location of the epicenter
M5.5 Earthquake near Near East Coast of Honshu, Japan · 2025-08-21 — Map showing the location of the epicenter

About this earthquake

On August 21, 2025 at 22:34 UTC, a magnitude M5.5 earthquake occurred near Near East Coast of Honshu, Japan. The hypocenter lay relatively close to the surface at around 10 km, increasing how strongly it was felt. Earthquakes of this magnitude can damage poorly built structures.

The data is provided by GFZ and cross-checked across seismological networks.

Details

ID
f5723ad65decb12faafde117eb7118d89903c7b8
Magnitude
M5.5
Depth
10.0 km
UTC time
2025-08-21 22:34:41 UTC
Local time
—
Country
—
Source
gfz
Coordinates
38.78000, 142.21000
Temperature
24.6°C

Depth profile

Depth profile Depth: 10 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 10 km
Shallow
10 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Nearby population centers

Distances are straight-line distances from the epicenter. Population data: GeoNames.

PlaceDistanceDirectionPopulation
Ōfunato53.6 kmNW35'452
Ishinomaki88.8 kmSW140'151
Sendai130.1 kmSW1'096'704

GeoNames · CC BY 4.0

Volcanoes nearby

  • Kurikomayama
    Distance: 125 km ·Stratovolcano ·Last eruption: 1950 ·Japan
  • Naruko
    Distance: 128 km ·Caldera ·Elevation: 470 m ·Last eruption: 837 ·Japan
  • Iwatesan Activity reported
    Distance: 158 km ·Complex ·Elevation: 2'038 m ·Last eruption: 1919 ·Japan
  • Akita-Komagatake
    Distance: 163 km ·Stratovolcano(es) ·Elevation: 1'637 m ·Last eruption: 1971 ·Japan
  • Zaozan [Zaosan]
    Distance: 170 km ·Complex ·Elevation: 1'841 m ·Last eruption: 1940 ·Japan
  • Hachimantai
    Distance: 175 km ·Stratovolcano ·Elevation: 1'613 m ·Last eruption: -5350 ·Japan

Radius · 100 km

Nearby infrastructure

Up to 3 nearest sites per category

Nuclear power plants

  • Onagawa nuclear power plantJapanOut of operation · Operating at dataset date · Permanently shut downReactor units at site: 3
    74.8 kmStraight-line distance

Source: Global Energy Monitor · Global Nuclear Power Tracker · Dataset date: 2026-08

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Subsequent earthquakes nearby

Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.

First 6 hours8
First 24 hours8
First 72 hours10
Strongest subsequent eventM6.0
M5.42025-08-21 22:34:42 UTC25.8 kmEvent of magnitude 5.4, near of Sendai (Monde) M5.52025-08-21 22:34:46 UTC13.2 km M5.82025-08-21 22:34:46 UTC9.8 kmNear east coast of eastern Honshu, Japan [Sea: Japan] M5.72025-08-21 22:34:46 UTC13.2 km51 km SE of Ōfunato, Japan M5.22025-08-21 22:34:49 UTC31.5 kmNear East Coast of Honshu, Japan M4.92025-08-21 23:06:10 UTC18.7 kmNear East Coast of Honshu, Japan M5.02025-08-21 23:06:18 UTC111.7 kmEvent of magnitude 5.0, near of Sendai (Monde) M4.52025-08-21 23:06:18 UTC8.0 km47 km SE of Ōfunato, Japan M3.72025-08-23 17:18:30 UTC11.8 kmNEAR EAST COAST OF HONSHU, JAPAN M3.62025-08-24 04:58:30 UTC91.7 kmNEAR EAST COAST OF HONSHU, JAPAN M3.32025-08-25 02:25:30 UTC22.6 kmNEAR EAST COAST OF HONSHU, JAPAN M4.02025-08-28 09:31:30 UTC64.2 kmNEAR EAST COAST OF HONSHU, JAPAN

No unambiguous area assignment

Context for this earthquake

This event has no unambiguous country assignment in the analysed catalogue. It is therefore not assigned to a regional profile.

Earthquake overview

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#1
Earlier events M≥449
Earlier events M≥54
Compared since2025-01-05

The QuakeMap24 comparison dataset begins on 2024-03-23. Earlier earthquakes may not be included.

Strongest earlier events

M5.52025-06-14 10:46:56 UTC63.9 km M5.22025-02-12 21:04:27 UTC71.2 kmNear East Coast of Honshu, Japan M5.12025-06-14 10:46:54 UTC47.1 kmNear East Coast of Honshu, Japan M5.02025-06-14 10:47:01 UTC33.2 kmNEAR EAST COAST OF HONSHU, JAPAN M4.92025-06-02 02:31:16 UTC46.5 kmNear East Coast of Honshu, Japan

Stats (last 24h)

Global (24h)
467
Country (24h)
—
—
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